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Abstract
The effects of curing temperature on the mechanical properties of concrete using natural pozzolan as cement replacement with the ratio of 20% by mass was investigated. Samples was cured at various temperatures of 10oC, 20oC, 30oC and 50oC until testing days. It is reported that for normal concrete without pozzolan cured at high temperature 50oC will have higher early age compressive strength (1, 3 and 7 days) than concrete cured at temperature of 10oC to 30oC but the late age of 28 days compressive strength is lower. However, for concrete using pozzolan as a partial replacement for cement, concrete cured at a high temperature of 50oC has a higher strength than that of other concrete cured at a temperature of 10oC to 30oC at ages from 1 to 28 days. It is possible that the pozzolanic reaction rate of natural pozzolan is usually slower than the hydration reaction of cement, so the negative effect of temperature on the strength development of cement was compensated by the strength development of natural pozzolan after 28 days of curing. Although the elastic modulus of concrete has the same trend as the compressive strength, the variation of elastic modulus is not as clear as the compressive strength.